Preparation of β-SiAlON bonded SiC composites by in-situ catalytic nitridation

doi:10.3969/j.issn.1001-1935.2022.03.002

Abstract

Abstract:

β-SiAlON (z=3) bonded SiC composites were prepared by in-situ catalytic nitridation using SiC particles,Si powder,Al powder and active α-Al₂O₃ powder as starting materials,and Fe as the catalyst.The effects of the nitriding temperature (1 350,1 400 and 1 450 ℃) and the Fe addition (1%,2% and 3% of the mass of Si powder) on the phase composition,the microstructure,the apparent porosity,the bulk density and the hot modulus of rupture of the composites were studied.The results show that the optimal nitridation temperature is 1 400 ℃ and the optimal Fe content is 1 mass% of the mass of Si powder;the sample prepared at 1 400 ℃ for 3 h has uniform β-SiAlON whisker diameter,higher nitriding degree,density and hot modulus of rupture.

Key words: β-SiAlON, silicon carbide material, Fe catalyst, density, hot modulus of rupture, phase composition

摘要：

以SiC颗粒、Si粉、Al粉和活性α-Al₂O₃粉为原料,以Fe为催化剂,采用原位催化氮化法制备了β-SiAlON(z=3)结合SiC材料。研究了氮化温度(分别为1 350、1 400和1 450 ℃)和Fe加入量(分别为Si粉质量的1%、2%和3%)对合成材料的物相组成、显微结构、显气孔率、体积密度和高温抗折强度的影响。结果表明:氮化温度以1 400 ℃为佳,Fe加入量以Si粉质量的1%为佳;加入Si粉质量的1%的Fe、在1 400 ℃保温3 h氮化制备的试样中生成的β-SiAlON晶须直径较为均匀,试样的氮化程度、致密度和高温抗折强度均较大。

关键词: β-SiAlON, SiC材料, Fe催化剂, 致密度, 高温抗折强度, 物相组成

CLC Number:

TQ175

Duan Hongjuan, Zhang Xiang-yang, Han Lei, Zhang Haijun. Preparation of β-SiAlON bonded SiC composites by in-situ catalytic nitridation[J]. Refractories, 2022, 56(3): 189-192.

段红娟, 张向阳, 韩磊, 张海军. 原位催化氮化制备β-SiAlON结合SiC材料[J]. 耐火材料, 2022, 56(3): 189-192.

Figures/Tables 8

Fig.1 XRD patterns of specimens prepared with different temperatures

Fig.2 SEM images of specimens prepared with different temperatures

Fig.3 Mass change of specimens prepared with different temperatures

Fig.4 XRD patterns of specimens prepared with different amounts of Fe catalyst

Fig.5 SEM images of specimens prepared with different amounts of Fe catalyst

Fig.6 Mass change of specimens prepared with different amounts of Fe catalyst

Fig.7 Apparent porosity and bulk density of specimens prepared with different amounts of Fe catalyst

Fig.8 Hot modulus of rupture of specimens prepared with different amounts of Fe catalyst

References 10

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